I've been considering opening a review/news site, and it would need the ability to list screenshots and videos, as well as SEO optimized articles (including tags). I was considering using Vbulletin with vbSEO, Dynamics, etc, but that would be more of a portal I would think instead of a true site.

Is there any tried and tested PHP CMS systems out there that would suit my purposes? Any help is appreciated. I'm a big fan of no branding, if possible. This can be free, or relatively cheap (around $200 and under).